Unexpected Hub firmware update tonight?! 8/30/17 (18.22)

[Nezmo]

Hub v2 Firmware update 18.22 rolling out right now

Investigating - Starting today, August 30 at 1 pm EDT, we will be automatically updating your SmartThings Hub v2 to the latest firmware (version 18.22). The release will continue throughout the day. To check your firmware version see: http://bit.ly/STHub_Firmware We apologize that we were unable to provide advance notification of this update as we strive to alert you to updates before applying them. However, due to a critical concern regarding your Hub’s connectivity, we need to apply the update without advance notification. Your Hub will briefly experience downtime of less than one minute as it reboots and applies the update. This update addresses a bug which can cause Hubs to go offline for an extended period of time. https://status.smartthings.com/

Hub Firmware Release Notes - 18.18

just got a notice for 18.22 upgrade, any idea what the fixes are ? thanks